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authorbunnei <bunneidev@gmail.com>2019-12-17 20:11:20 +0100
committerGitHub <noreply@github.com>2019-12-17 20:11:20 +0100
commit8825b88a4589c249e9faa53f3ec90e582fa64198 (patch)
treeed8924086e528f13e5d38b100cad9a38e06c4d3a /src
parentMerge pull request #3182 from ReinUsesLisp/renderer-opengl (diff)
parentcommon: SPSCQueue: Notify after incrementing queue size. (diff)
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-rw-r--r--src/common/threadsafe_queue.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/src/common/threadsafe_queue.h b/src/common/threadsafe_queue.h
index e714ba5b3..8268bbd5c 100644
--- a/src/common/threadsafe_queue.h
+++ b/src/common/threadsafe_queue.h
@@ -46,9 +46,16 @@ public:
ElementPtr* new_ptr = new ElementPtr();
write_ptr->next.store(new_ptr, std::memory_order_release);
write_ptr = new_ptr;
- cv.notify_one();
- ++size;
+ const size_t previous_size{size++};
+
+ // Acquire the mutex and then immediately release it as a fence.
+ // TODO(bunnei): This can be replaced with C++20 waitable atomics when properly supported.
+ // See discussion on https://github.com/yuzu-emu/yuzu/pull/3173 for details.
+ if (previous_size == 0) {
+ std::lock_guard lock{cv_mutex};
+ }
+ cv.notify_one();
}
void Pop() {